The car travels the first 2 km of the way in 3 minutes, and the next 10 km – in 7 minutes.

The car travels the first 2 km of the way in 3 minutes, and the next 10 km – in 7 minutes. Determine the average speed of the car along the way.

Given:
s1 = 2km,
t1 = 3min,
s2 = 10km,
t2 = 7min;
Find: v -?
The average body speed is determined by the ratio of the total distance traveled to the time spent:
v = s / t,
Where
s = s1 + s2 = 2km + 10km = 12km = 12000m – distance covered;
t = t1 + t2 = 3min + 7min = 10min = 600s – time spent on the whole way;
v = 12000m / 600s = 20m / s.